To provide bonding structure and a waterproof floor, from which water does not leak, in which places can be adjusted relatively and cost of which is reduced and for which mandays are not required.

In the bonding structure of tabular bodies, a plurality of rows of the tabular bodies 2, 3 are arranged in parallel on the top face of a foundation material 1, and the adjacent mutually parallel side edges of a plurality of rows of the tabular bodies 2, 3 are united. An upright section 21 formed by upwards bending the side edge of the adjacent tabular body 2 is formed to the side edge at that time, a groove section 31 bent in an approximately U shape and opened downwards is shaped at the side edge of the tabular body 3, the upright section 21 is inserted into the groove section 31, and the adjacent tabular bodies 2, 3 can be moved relatively in the rectangular direction to the side edges.